Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
Vehicle » Heating and Air Conditioning » Compressor HVAC » Description and Operation  
  Description and Operation  



  • Internal A/C compressor components are not repaired separately. The FS-10 A/C compressor is serviced only as an assembly. The A/C clutch, A/C clutch pulley, A/C clutch field coil and the shaft seals are repairable.
  • Installation of a new suction accumulator is not required when repairing the air conditioning system except when there is physical evidence of system contamination from a failed A/C compressor or damage to the suction accumulator.

The FS-10 A/C compressor has the following characteristics:

  • A ten-cylinder swashplate design utilizing the tangential design mount.
  • A one-piece lip-type seal (renewable from the front of the A/C compressor) is used to seal it at the shaft opening in the assembly.
  • Five double-acting pistons operate within the cylinder assembly. The pistons are actuated by a swashplate that changes the rotating action of the shaft to a reciprocating force.
  • Reed-type discharge valves are located between the cylinder assembly and the head at each end of the A/C compressor.
  • The A/C compressor uses PAG oil. This oil contains special additives required for the A/C compressor.
  • The A/C compressor oil from vehicles equipped with an FS-10 A/C compressor may have a dark color while maintaining a normal oil viscosity. This is normal for this A/C compressor because carbon from the piston rings will discolor the oil.


The magnetic A/C clutch has the following characteristics:

  • It drives the compressor shaft.
  • When battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch disc and hub assembly is drawn toward the A/C clutch pulley.
  • The magnetic force locks the clutch disc and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
  • When B+ is removed from the A/C clutch field coil, springs in the clutch disc and hub assembly move the clutch disc away from the A/C clutch pulley.